%% 
%%  A DANTE-Edition example
%% 
%%  Example 02-18-4 on page 89.
%% 
%%  Copyright (C) 2010 Herbert Voss
%% 
%%  It may be distributed and/or modified under the conditions
%%  of the LaTeX Project Public License, either version 1.3
%%  of this license or (at your option) any later version.
%% 
%%  See http://www.latex-project.org/lppl.txt for details.
%% 
%% 
%% ==== 
% Show page(s) 1
%% 
\documentclass[]{article}
\pagestyle{empty}
\setlength\textwidth{201.70511pt}
\setlength\parindent{0pt}
\usepackage[utf8]{inputenc}
\usepackage[english]{babel}
\setlength\textwidth{6cm}
\setlength\parskip{8pt plus 3pt}
\AtBeginDocument{\small}

\usepackage{tabularx,ragged2e}

\begin{document}
Text before the table, which spans the
whole line to show that the table is
that wide as well.\par
\begin{tabularx}{\linewidth}{|
 >{\setlength\hsize{0.7\hsize}\RaggedRight}X|
 >{\RaggedRight}p{1cm}|
 >{\setlength\hsize{1.3\hsize}
   \RaggedRight}X|}
The width of this column is determined
automatically. & This column is 1\,cm
wide. & The width of this column is
determined automatically.
\end{tabularx}\par
Text after the table, which spans the
whole line to show that the table is
that wide as well.
\end{document}